Prevalue Source Types Overview
There are some default prevalue source types that can be used. In this article, we will give a quick overview of them:
Get values from textfile
Upload a textfile that contains the prevalues. Each prevalue should have its own line in the file. Once the file has been uploaded, you can find it in ~/wwwroot/App_Data/UmbracoForms/Data/PreValueTextFiles/{GUID}
where the {GUID}
is replaced with the pre-value ID.

Umbraco Documents
Allows you to use content nodes from a specific source as prevalues. Configure the following options in the Details section:
Define the root node by either:
Selecting the type of item the picker should target such as Content, Media, or Members, or
Specifying a dynamic root.
Enable Use current page as root instead of choosing a specific root node. Preview is not available when this setting is enabled.
Choose a specific Document type, if the selected root node contains a different Document Type.
Select the Value field to define the value stored for the prevalue.
Select the Caption field to define the label shown in the list.
Enable List all Descendants of the selected root node to include all child nodes beneath the root.
Select Order by from the drop-down list to display how the prevalue list is sorted.
Select your preferred Cache option for caching the list of prevalues when rendering in a form.

SQL Database
Connect to a OleDB compatible database table and construct a prevalue source from it. Once selected, it will be editable from the Forms interface.
Configure the following options in the Details section:
Connection string (either choose one from your web.config or add another from a textfield).
Connection String from configuration
Table Name
Key Column
Value Column
Caption Column
Select your preferred Cache option for caching the list of prevalues when rendering in a form.

Umbraco Data Type Prevalues
Choose an Umbraco Data Type to use its configured prevalue collection.
In the example below, the prevalue collection from a Data Type called Home - Font - Radio button
is used:

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